Our Facilities

As a high-pressure (1440 psi Maximum Allowable Operating Pressure [MAOP]) interstate natural gas transmission pipeline, Iroquois transports clean-burning natural gas from a variety of supply locations to other transmission pipelines, power plants, industrial users, and local distribution companies who then deliver it to residential and commercial users.


Iroquois’ transmission pipeline is buried underground at a depth that meets or exceeds pipeline safety regulations. The pipe itself is made of high-strength micro-alloyed steel with a designed wall thickness to meet stringent federal regulations for specific locations and pressure of the pipeline. All welds were inspected both visually and with radiographic equipment by a third party expert, and then the pipeline was coated with a fusion-bond epoxy coating engineered to resist corrosion and provide a waterproof barrier between the steel pipe and the external environment.

Before being placed into service, the pipeline was tested by pressurizing it to higher than the maximum allowable operating pressure.

Buried Pipe

Compressor Stations

Compressor stations along our pipeline are strategically placed to boost natural gas pressure to counter pressure lost through friction as the gas travels through the system, or as it is transported to various delivery points. Many of our compressor stations also have cooling facilities that use electric-motor-driven fans designed to cool the gas as it leaves the compressor station. The coolers keep temperatures within safe operating conditions and enable more volume to flow back into the pipeline.

Meter Stations and Automated Valves

Meter stations measure gas volumes at each delivery point on our system. Automated valves control gas flow through the pipeline, and can be operated locally by a trained technician, remotely by gas control, or automatically based on pre-determined set points, enabling quick shut off of the pipeline should an emergency arise.

Mainline Valve

Pipeline Maintenance Activities

Our compressor station operators and field engineers continually perform an array of surveillance and maintenance tasks to ensure the continued safe operation of our system.

In the event that Iroquois schedules maintenance or other activity that may cause loud noise or odor to be detectable by residents within close proximity of the pipeline, notice, and updates for such may be provided here.

2022 Scheduled Maintenance - Pipeline Internal Monitoring

If you have any questions regarding this work, please call Iroquois’ non-emergency hotline at 1-800-253-5152. If you have a safety concern during the planned activity, please call Iroquois’ Gas Control Center at 1-800-888-3982.

In-Line Inspection Schedule* - Gauge Tool

Date Time Location Activity Status
Monday, April 11 Morning Wright, NY Launch Tool Completed
Tuesday, April 12 Mid-Day Pleasant Valley, NY Receive Tool Completed
Tuesday, April 12 Morning Milford, CT Launch Tool Completed
Wednesday, April 13 Morning to Mid-Day South Commack, NY Receive Tool Completed
Monday, May 16 Morning Pleasant Valley, NY Launch Tool Completed
Wednesday, May 18 Mid-morning Milford, CT Receive Tool Completed
*Dates/Times may vary and are subject to change

In-Line Inspection Schedule* - Smart Tool

Date Time Location Activity Status
Monday, June 20 Morning Milford, CT Insert Tool Completed
Tuesday, June 21 Late afternoon South Commack, NY Extract Tool Completed
Wednesday, June 22 Morning Wright, NY Insert Tool Completed
Friday, June 24 Morning Pleasant Valley, NY Extract Tool Completed
Monday, June 27 Morning Pleasant Valley, NY Insert Tool Completed
Wednesday, June 29 Morning Milford, CT Extract Tool Completed
*Dates/TImes may vary and are subject to change